feat: Experimental support for encryption using libcrux

Libcrux is a library for formally verified implementations of
cryptographic primitives. It uses multiple back ends; one of which is
libjade. A cryptographic library written in the jasmin assembly
language for high assurance cryptographic implementations.

To use compile with the experiment_libcrux feature enabled:

    cargo build --features experiment_libcrux

.github/workflows/qc.yaml

@@ -110,7 +110,12 @@ jobs:
       - run: RUSTDOCFLAGS="-D warnings" cargo doc --no-deps --document-private-items
 
   cargo-test:
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ubuntu-latest, macos-13]
+        # - ubuntu is x86-64
+        # - macos-13 is also x86-64 architecture
     steps:
       - uses: actions/checkout@v3
       - uses: actions/cache@v3

.mailmap

@@ -0,0 +1 @@
+Clara Engler <cve@cve.cx> <me@emilengler.com>

Cargo.lock

@@ -387,9 +387,9 @@ dependencies = [
 
 [[package]]
 name = "clap"
-version = "4.5.7"
+version = "4.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "5db83dced34638ad474f39f250d7fea9598bdd239eaced1bdf45d597da0f433f"
+checksum = "84b3edb18336f4df585bc9aa31dd99c036dfa5dc5e9a2939a722a188f3a8970d"
 dependencies = [
  "clap_builder",
  "clap_derive",
@@ -397,9 +397,9 @@ dependencies = [
 
 [[package]]
 name = "clap_builder"
-version = "4.5.7"
+version = "4.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "f7e204572485eb3fbf28f871612191521df159bc3e15a9f5064c66dba3a8c05f"
+checksum = "c1c09dd5ada6c6c78075d6fd0da3f90d8080651e2d6cc8eb2f1aaa4034ced708"
 dependencies = [
  "anstream",
  "anstyle",
@@ -409,9 +409,9 @@ dependencies = [
 
 [[package]]
 name = "clap_derive"
-version = "4.5.5"
+version = "4.5.8"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "c780290ccf4fb26629baa7a1081e68ced113f1d3ec302fa5948f1c381ebf06c6"
+checksum = "2bac35c6dafb060fd4d275d9a4ffae97917c13a6327903a8be2153cd964f7085"
 dependencies = [
  "heck",
  "proc-macro2",
@@ -984,8 +984,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "c4567c8db10ae91089c99af84c68c38da3ec2f087c3f82960bcdbf3656b6f4d7"
 dependencies = [
  "cfg-if 1.0.0",
+ "js-sys",
  "libc",
  "wasi 0.11.0+wasi-snapshot-preview1",
+ "wasm-bindgen",
 ]
 
 [[package]]
@@ -1066,6 +1068,12 @@ version = "0.3.9"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d231dfb89cfffdbc30e7fc41579ed6066ad03abda9e567ccafae602b97ec5024"
 
+[[package]]
+name = "hex"
+version = "0.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7f24254aa9a54b5c858eaee2f5bccdb46aaf0e486a595ed5fd8f86ba55232a70"
+
 [[package]]
 name = "home"
 version = "0.5.9"
@@ -1222,6 +1230,38 @@ version = "0.2.155"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "97b3888a4aecf77e811145cadf6eef5901f4782c53886191b2f693f24761847c"
 
+[[package]]
+name = "libcrux"
+version = "0.0.2-pre.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "31d9dcd435758db03438089760c55a45e6bcab7e4e299ee261f75225ab29d482"
+dependencies = [
+ "getrandom 0.2.15",
+ "libcrux-hacl",
+ "libcrux-platform",
+ "libjade-sys",
+ "rand 0.8.5",
+]
+
+[[package]]
+name = "libcrux-hacl"
+version = "0.0.2-pre.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "52b2581ce493c5c22700077b5552b47be69b67b8176716572b02856218db0b68"
+dependencies = [
+ "cc",
+ "libcrux-platform",
+]
+
+[[package]]
+name = "libcrux-platform"
+version = "0.0.2-pre.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "647e39666194b11df17c19451d1154b9be79df98b9821532560c2ecad0cf3410"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "libfuzzer-sys"
 version = "0.4.7"
@@ -1233,6 +1273,16 @@ dependencies = [
  "once_cell",
 ]
 
+[[package]]
+name = "libjade-sys"
+version = "0.0.2-pre.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec4d22bba476bf8f5aebe36ccfd0e56dba8707e0c3b5c76996576028f48ffb8e"
+dependencies = [
+ "cc",
+ "libcrux-platform",
+]
+
 [[package]]
 name = "libloading"
 version = "0.8.3"
@@ -1261,9 +1311,9 @@ dependencies = [
 
 [[package]]
 name = "log"
-version = "0.4.21"
+version = "0.4.22"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "90ed8c1e510134f979dbc4f070f87d4313098b704861a105fe34231c70a3901c"
+checksum = "a7a70ba024b9dc04c27ea2f0c0548feb474ec5c54bba33a7f72f873a39d07b24"
 
 [[package]]
 name = "memchr"
@@ -1885,7 +1935,7 @@ name = "rosenpass"
 version = "0.2.1"
 dependencies = [
  "anyhow",
- "clap 4.5.7",
+ "clap 4.5.8",
  "criterion",
  "derive_builder 0.20.0",
  "env_logger",
@@ -1924,6 +1974,7 @@ dependencies = [
  "anyhow",
  "blake2",
  "chacha20poly1305",
+ "libcrux",
  "rosenpass-constant-time",
  "rosenpass-oqs",
  "rosenpass-secret-memory",
@@ -2008,7 +2059,7 @@ name = "rosenpass-wireguard-broker"
 version = "0.1.0"
 dependencies = [
  "anyhow",
- "clap 4.5.7",
+ "clap 4.5.8",
  "derive_builder 0.20.0",
  "env_logger",
  "log",
@@ -2325,6 +2376,12 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "take-until"
+version = "0.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4e17d8598067a8c134af59cd33c1c263470e089924a11ab61cf61690919fe3b"
+
 [[package]]
 name = "tempfile"
 version = "3.10.1"
@@ -2857,8 +2914,10 @@ source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "89ba4e9811befc20af3b6efb15924a7238ee5e8e8706a196576462a00b9f1af1"
 dependencies = [
  "derive_builder 0.10.2",
+ "hex",
  "libc",
  "neli",
+ "take-until",
  "thiserror",
 ]
 
@@ -2886,9 +2945,9 @@ dependencies = [
 
 [[package]]
 name = "zerocopy"
-version = "0.7.34"
+version = "0.7.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "ae87e3fcd617500e5d106f0380cf7b77f3c6092aae37191433159dda23cfb087"
+checksum = "1b9b4fd18abc82b8136838da5d50bae7bdea537c574d8dc1a34ed098d6c166f0"
 dependencies = [
  "byteorder",
  "zerocopy-derive",
@@ -2896,9 +2955,9 @@ dependencies = [
 
 [[package]]
 name = "zerocopy-derive"
-version = "0.7.34"
+version = "0.7.35"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "15e934569e47891f7d9411f1a451d947a60e000ab3bd24fbb970f000387d1b3b"
+checksum = "fa4f8080344d4671fb4e831a13ad1e68092748387dfc4f55e356242fae12ce3e"
 dependencies = [
  "proc-macro2",
  "quote",

Cargo.toml

@@ -44,8 +44,8 @@ allocator-api2 = "0.2.14"
 memsec = { git="https://github.com/rosenpass/memsec.git" ,rev="aceb9baee8aec6844125bd6612f92e9a281373df", features = [ "alloc_ext", ] }
 rand = "0.8.5"
 typenum = "1.17.0"
-log = { version = "0.4.21" }
+log = { version = "0.4.22" }
-clap = { version = "4.5.7", features = ["derive"] }
+clap = { version = "4.5.8", features = ["derive"] }
 serde = { version = "1.0.203", features = ["derive"] }
 arbitrary = { version = "1.3.2", features = ["derive"] }
 anyhow = { version = "1.0.86", features = ["backtrace", "std"] }
@@ -59,11 +59,12 @@ chacha20poly1305 = { version = "0.10.1", default-features = false, features = [
     "std",
     "heapless",
 ] }
-zerocopy = { version = "0.7.34", features = ["derive"] }
+zerocopy = { version = "0.7.35", features = ["derive"] }
 home = "0.5.9"
 derive_builder = "0.20.0"
 tokio = { version = "1.38", features = ["macros", "rt-multi-thread"] }
 postcard= {version = "1.0.8", features = ["alloc"]}
+libcrux = { version = "0.0.2-pre.2" }
 
 #Dev dependencies
 serial_test = "3.1.1"
@@ -77,6 +78,6 @@ procspawn = {version = "1.0.0", features= ["test-support"]}
 
 
 #Broker dependencies (might need cleanup or changes)
-wireguard-uapi = "3.0.0"
+wireguard-uapi = { version = "3.0.0", features = ["xplatform"] }
 command-fds = "0.2.3"
 rustix = { version = "0.38.27", features = ["net"] }

ciphers/Cargo.toml

@@ -9,6 +9,9 @@ homepage = "https://rosenpass.eu/"
 repository = "https://github.com/rosenpass/rosenpass"
 readme = "readme.md"
 
+[features]
+experiment_libcrux = ["dep:libcrux"]
+
 [dependencies]
 anyhow = { workspace = true }
 rosenpass-to = { workspace = true }
@@ -20,3 +23,4 @@ static_assertions = { workspace = true }
 zeroize = { workspace = true }
 chacha20poly1305 = { workspace = true }
 blake2 = { workspace = true }
+libcrux = { workspace = true, optional = true } 

ciphers/src/lib.rs

@@ -9,6 +9,9 @@ const_assert!(KEY_LEN == hash_domain::KEY_LEN);
 
 /// Authenticated encryption with associated data
 pub mod aead {
+    #[cfg(not(feature = "libcrux"))]
+    pub use crate::subtle::chacha20poly1305_ietf::{decrypt, encrypt, KEY_LEN, NONCE_LEN, TAG_LEN};
+    #[cfg(feature = "libcrux")]
     pub use crate::subtle::chacha20poly1305_ietf::{decrypt, encrypt, KEY_LEN, NONCE_LEN, TAG_LEN};
 }
 

ciphers/src/subtle/chacha20poly1305_ietf_libcrux.rs

@@ -0,0 +1,60 @@
+use rosenpass_to::ops::copy_slice;
+use rosenpass_to::To;
+
+use zeroize::Zeroize;
+
+pub const KEY_LEN: usize = 32; // Grrrr! Libcrux, please provide me these constants.
+pub const TAG_LEN: usize = 16;
+pub const NONCE_LEN: usize = 12;
+
+#[inline]
+pub fn encrypt(
+    ciphertext: &mut [u8],
+    key: &[u8],
+    nonce: &[u8],
+    ad: &[u8],
+    plaintext: &[u8],
+) -> anyhow::Result<()> {
+    let (ciphertext, mac) = ciphertext.split_at_mut(ciphertext.len() - TAG_LEN);
+
+    use libcrux::aead as C;
+    let crux_key = C::Key::Chacha20Poly1305(C::Chacha20Key(key.try_into().unwrap()));
+    let crux_iv = C::Iv(nonce.try_into().unwrap());
+
+    copy_slice(plaintext).to(ciphertext);
+    let crux_tag = libcrux::aead::encrypt(&crux_key, ciphertext, crux_iv, ad).unwrap();
+    copy_slice(crux_tag.as_ref()).to(mac);
+
+    match crux_key {
+        C::Key::Chacha20Poly1305(mut k) => k.0.zeroize(),
+        _ => panic!(),
+    }
+
+    Ok(())
+}
+
+#[inline]
+pub fn decrypt(
+    plaintext: &mut [u8],
+    key: &[u8],
+    nonce: &[u8],
+    ad: &[u8],
+    ciphertext: &[u8],
+) -> anyhow::Result<()> {
+    let (ciphertext, mac) = ciphertext.split_at(ciphertext.len() - TAG_LEN);
+
+    use libcrux::aead as C;
+    let crux_key = C::Key::Chacha20Poly1305(C::Chacha20Key(key.try_into().unwrap()));
+    let crux_iv = C::Iv(nonce.try_into().unwrap());
+    let crux_tag = C::Tag::from_slice(mac).unwrap();
+
+    copy_slice(ciphertext).to(plaintext);
+    libcrux::aead::decrypt(&crux_key, plaintext, crux_iv, ad, &crux_tag).unwrap();
+
+    match crux_key {
+        C::Key::Chacha20Poly1305(mut k) => k.0.zeroize(),
+        _ => panic!(),
+    }
+
+    Ok(())
+}

ciphers/src/subtle/mod.rs

@@ -1,4 +1,7 @@
 pub mod blake2b;
+#[cfg(not(feature = "libcrux"))]
 pub mod chacha20poly1305_ietf;
+#[cfg(feature = "libcrux")]
+pub mod chacha20poly1305_ietf_libcrux;
 pub mod incorrect_hmac_blake2b;
 pub mod xchacha20poly1305_ietf;

doc/rosenpass.1

@@ -108,7 +108,7 @@ Rosenpass was created by Karolin Varner, Benjamin Lipp, Wanja Zaeske,
 Marei Peischl, Stephan Ajuvo, and Lisa Schmidt.
 .Pp
 This manual page was written by
-.An Emil Engler
+.An Clara Engler
 .Sh BUGS
 The bugs are tracked at
 .Lk https://github.com/rosenpass/rosenpass/issues .

doc/rp.1

@@ -113,7 +113,7 @@ Rosenpass was created by Karolin Varner, Benjamin Lipp, Wanja Zaeske,
 Marei Peischl, Stephan Ajuvo, and Lisa Schmidt.
 .Pp
 This manual page was written by
-.An Emil Engler
+.An Clara Engler
 .Sh BUGS
 The bugs are tracked at
 .Lk https://github.com/rosenpass/rosenpass/issues .

fuzz/Cargo.toml

@@ -4,6 +4,9 @@ version = "0.0.1"
 publish = false
 edition = "2021"
 
+[features]
+experiment_libcrux = ["rosenpass-ciphers/experiment_libcrux"]
+
 [package.metadata]
 cargo-fuzz = true
 
@@ -81,4 +84,4 @@ doc = false
 name = "fuzz_vec_secret_alloc_memfdsec_mallocfb"
 path = "fuzz_targets/vec_secret_alloc_memfdsec_mallocfb.rs"
 test = false
-doc = false
+doc = false

fuzz/fuzz_targets/handle_msg.rs

@@ -7,14 +7,14 @@ use rosenpass::protocol::CryptoServer;
 use rosenpass_cipher_traits::Kem;
 use rosenpass_ciphers::kem::StaticKem;
 use rosenpass_secret_memory::policy::*;
-use rosenpass_secret_memory::Secret;
+use rosenpass_secret_memory::{PublicBox, Secret};
 use std::sync::Once;
 
 static ONCE: Once = Once::new();
 fuzz_target!(|rx_buf: &[u8]| {
     ONCE.call_once(secret_policy_use_only_malloc_secrets);
     let sk = Secret::from_slice(&[0; StaticKem::SK_LEN]);
-    let pk = Secret::from_slice(&[0; StaticKem::PK_LEN]);
+    let pk = PublicBox::from_slice(&[0; StaticKem::PK_LEN]);
 
     let mut cs = CryptoServer::new(sk, pk);
     let mut tx_buf = [0; 10240];

fuzz/fuzz_targets/kyber_encaps.rs

@@ -14,7 +14,7 @@ pub struct Input {
 
 fuzz_target!(|input: Input| {
     let mut ciphertext = [0u8; EphemeralKem::CT_LEN];
-    let mut shared_secret = [0u8; EphemeralKem::SK_LEN];
+    let mut shared_secret = [0u8; EphemeralKem::SHK_LEN];
 
     EphemeralKem::encaps(&mut shared_secret, &mut ciphertext, &input.pk).unwrap();
 });

rosenpass/Cargo.toml

@@ -53,4 +53,5 @@ procspawn = {workspace = true}
 
 [features]
 enable_broker_api = ["rosenpass-wireguard-broker/enable_broker_api"]
-enable_memfd_alloc = []
+enable_memfd_alloc = []
+experiment_libcrux = ["rosenpass-ciphers/experiment_libcrux"]

rosenpass/benches/handshake.rs

@@ -1,5 +1,6 @@
 use anyhow::Result;
 use rosenpass::protocol::{CryptoServer, HandleMsgResult, MsgBuf, PeerPtr, SPk, SSk, SymKey};
+use std::ops::DerefMut;
 
 use rosenpass_cipher_traits::Kem;
 use rosenpass_ciphers::kem::StaticKem;
@@ -40,7 +41,7 @@ fn hs(ini: &mut CryptoServer, res: &mut CryptoServer) -> Result<()> {
 
 fn keygen() -> Result<(SSk, SPk)> {
     let (mut sk, mut pk) = (SSk::zero(), SPk::zero());
-    StaticKem::keygen(sk.secret_mut(), pk.secret_mut())?;
+    StaticKem::keygen(sk.secret_mut(), pk.deref_mut())?;
     Ok((sk, pk))
 }
 

rosenpass/src/cli.rs

@@ -6,10 +6,11 @@ use rosenpass_secret_memory::file::StoreSecret;
 use rosenpass_secret_memory::{
     secret_policy_try_use_memfd_secrets, secret_policy_use_only_malloc_secrets,
 };
-use rosenpass_util::file::{LoadValue, LoadValueB64};
+use rosenpass_util::file::{LoadValue, LoadValueB64, StoreValue};
 use rosenpass_wireguard_broker::brokers::native_unix::{
     NativeUnixBroker, NativeUnixBrokerConfigBaseBuilder, NativeUnixBrokerConfigBaseBuilderError,
 };
+use std::ops::DerefMut;
 use std::path::PathBuf;
 
 use crate::app_server::AppServerTest;
@@ -370,7 +371,7 @@ impl CliCommand {
 fn generate_and_save_keypair(secret_key: PathBuf, public_key: PathBuf) -> anyhow::Result<()> {
     let mut ssk = crate::protocol::SSk::random();
     let mut spk = crate::protocol::SPk::random();
-    StaticKem::keygen(ssk.secret_mut(), spk.secret_mut())?;
+    StaticKem::keygen(ssk.secret_mut(), spk.deref_mut())?;
     ssk.store_secret(secret_key)?;
     spk.store(public_key)
 }

rosenpass/src/protocol.rs

@@ -19,6 +19,7 @@
 //! [CryptoServer].
 //!
 //! ```
+//! use std::ops::DerefMut;
 //! use rosenpass_secret_memory::policy::*;
 //! use rosenpass_cipher_traits::Kem;
 //! use rosenpass_ciphers::kem::StaticKem;
@@ -32,11 +33,11 @@
 //!
 //! // initialize secret and public key for peer a ...
 //! let (mut peer_a_sk, mut peer_a_pk) = (SSk::zero(), SPk::zero());
-//! StaticKem::keygen(peer_a_sk.secret_mut(), peer_a_pk.secret_mut())?;
+//! StaticKem::keygen(peer_a_sk.secret_mut(), peer_a_pk.deref_mut())?;
 //!
 //! // ... and for peer b
 //! let (mut peer_b_sk, mut peer_b_pk) = (SSk::zero(), SPk::zero());
-//! StaticKem::keygen(peer_b_sk.secret_mut(), peer_b_pk.secret_mut())?;
+//! StaticKem::keygen(peer_b_sk.secret_mut(), peer_b_pk.deref_mut())?;
 //!
 //! // initialize server and a pre-shared key
 //! let psk = SymKey::random();
@@ -71,6 +72,7 @@
 
 use std::convert::Infallible;
 use std::mem::size_of;
+use std::ops::Deref;
 use std::{
     collections::hash_map::{
         Entry::{Occupied, Vacant},
@@ -88,7 +90,7 @@ use rosenpass_ciphers::hash_domain::{SecretHashDomain, SecretHashDomainNamespace
 use rosenpass_ciphers::kem::{EphemeralKem, StaticKem};
 use rosenpass_ciphers::{aead, xaead, KEY_LEN};
 use rosenpass_constant_time as constant_time;
-use rosenpass_secret_memory::{Public, Secret};
+use rosenpass_secret_memory::{Public, PublicBox, Secret};
 use rosenpass_util::{cat, mem::cpy_min, ord::max_usize, time::Timebase};
 use zerocopy::{AsBytes, FromBytes, Ref};
 
@@ -163,7 +165,7 @@ pub fn has_happened(ev: Timing, now: Timing) -> bool {
 
 // DATA STRUCTURES & BASIC TRAITS & ACCESSORS ////
 
-pub type SPk = Secret<{ StaticKem::PK_LEN }>; // Just Secret<> instead of Public<> so it gets allocated on the heap
+pub type SPk = PublicBox<{ StaticKem::PK_LEN }>;
 pub type SSk = Secret<{ StaticKem::SK_LEN }>;
 pub type EPk = Public<{ EphemeralKem::PK_LEN }>;
 pub type ESk = Secret<{ EphemeralKem::SK_LEN }>;
@@ -548,7 +550,7 @@ impl CryptoServer {
     pub fn pidm(&self) -> Result<PeerId> {
         Ok(Public::new(
             hash_domains::peerid()?
-                .mix(self.spkm.secret())?
+                .mix(self.spkm.deref())?
                 .into_value()))
     }
 
@@ -708,7 +710,7 @@ impl Peer {
     pub fn pidt(&self) -> Result<PeerId> {
         Ok(Public::new(
             hash_domains::peerid()?
-                .mix(self.spkt.secret())?
+                .mix(self.spkt.deref())?
                 .into_value()))
     }
 }
@@ -1017,7 +1019,7 @@ impl CryptoServer {
 
         let cookie_value = active_cookie_value.unwrap();
         let cookie_key = hash_domains::cookie_key()?
-            .mix(self.spkm.secret())?
+            .mix(self.spkm.deref())?
             .into_value();
 
         let mut msg_out = truncating_cast_into::<CookieReply>(tx_buf)?;
@@ -1509,7 +1511,7 @@ where
     /// Calculate the message authentication code (`mac`) and also append cookie value
     pub fn seal(&mut self, peer: PeerPtr, srv: &CryptoServer) -> Result<()> {
         let mac = hash_domains::mac()?
-            .mix(peer.get(srv).spkt.secret())?
+            .mix(peer.get(srv).spkt.deref())?
             .mix(&self.as_bytes()[span_of!(Self, msg_type..mac)])?;
         self.mac.copy_from_slice(mac.into_value()[..16].as_ref());
         self.seal_cookie(peer, srv)?;
@@ -1536,7 +1538,7 @@ where
     /// Check the message authentication code
     pub fn check_seal(&self, srv: &CryptoServer) -> Result<bool> {
         let expected = hash_domains::mac()?
-            .mix(srv.spkm.secret())?
+            .mix(srv.spkm.deref())?
             .mix(&self.as_bytes()[span_of!(Self, msg_type..mac)])?;
         Ok(constant_time::memcmp(
             &self.mac,
@@ -1641,7 +1643,7 @@ impl HandshakeState {
 
         // calculate ad contents
         let ad = hash_domains::biscuit_ad()?
-            .mix(srv.spkm.secret())?
+            .mix(srv.spkm.deref())?
             .mix(self.sidi.as_slice())?
             .mix(self.sidr.as_slice())?
             .into_value();
@@ -1676,7 +1678,7 @@ impl HandshakeState {
 
         // Calculate additional data fields
         let ad = hash_domains::biscuit_ad()?
-            .mix(srv.spkm.secret())?
+            .mix(srv.spkm.deref())?
             .mix(sidi.as_slice())?
             .mix(sidr.as_slice())?
             .into_value();
@@ -1763,7 +1765,7 @@ impl CryptoServer {
         let mut hs = InitiatorHandshake::zero_with_timestamp(self);
 
         // IHI1
-        hs.core.init(peer.get(self).spkt.secret())?;
+        hs.core.init(peer.get(self).spkt.deref())?;
 
         // IHI2
         hs.core.sidi.randomize();
@@ -1780,7 +1782,7 @@ impl CryptoServer {
         hs.core
             .encaps_and_mix::<StaticKem, { StaticKem::SHK_LEN }>(
                 ih.sctr.as_mut_slice(),
-                peer.get(self).spkt.secret(),
+                peer.get(self).spkt.deref(),
             )?;
 
         // IHI6
@@ -1789,7 +1791,7 @@ impl CryptoServer {
 
         // IHI7
         hs.core
-            .mix(self.spkm.secret())?
+            .mix(self.spkm.deref())?
             .mix(peer.get(self).psk.secret())?;
 
         // IHI8
@@ -1807,7 +1809,7 @@ impl CryptoServer {
         core.sidi = SessionId::from_slice(&ih.sidi);
 
         // IHR1
-        core.init(self.spkm.secret())?;
+        core.init(self.spkm.deref())?;
 
         // IHR4
         core.mix(&ih.sidi)?.mix(&ih.epki)?;
@@ -1815,7 +1817,7 @@ impl CryptoServer {
         // IHR5
         core.decaps_and_mix::<StaticKem, { StaticKem::SHK_LEN }>(
             self.sskm.secret(),
-            self.spkm.secret(),
+            self.spkm.deref(),
             &ih.sctr,
         )?;
 
@@ -1828,7 +1830,7 @@ impl CryptoServer {
         };
 
         // IHR7
-        core.mix(peer.get(self).spkt.secret())?
+        core.mix(peer.get(self).spkt.deref())?
             .mix(peer.get(self).psk.secret())?;
 
         // IHR8
@@ -1848,7 +1850,7 @@ impl CryptoServer {
         // RHR5
         core.encaps_and_mix::<StaticKem, { StaticKem::SHK_LEN }>(
             &mut rh.scti,
-            peer.get(self).spkt.secret(),
+            peer.get(self).spkt.deref(),
         )?;
 
         // RHR6
@@ -1909,14 +1911,14 @@ impl CryptoServer {
         // RHI4
         core.decaps_and_mix::<EphemeralKem, { EphemeralKem::SHK_LEN }>(
             hs!().eski.secret(),
-            &*hs!().epki,
+            hs!().epki.deref(),
             &rh.ecti,
         )?;
 
         // RHI5
         core.decaps_and_mix::<StaticKem, { StaticKem::SHK_LEN }>(
             self.sskm.secret(),
-            self.spkm.secret(),
+            self.spkm.deref(),
             &rh.scti,
         )?;
 
@@ -2113,7 +2115,7 @@ impl CryptoServer {
                     ),
                 }?;
 
-                let spkt = peer.get(self).spkt.secret();
+                let spkt = peer.get(self).spkt.deref();
                 let cookie_key = hash_domains::cookie_key()?.mix(spkt)?.into_value();
                 let cookie_value = peer.cv().update_mut(self).unwrap();
 
@@ -2146,7 +2148,7 @@ fn truncating_cast_into_nomut<T: FromBytes>(buf: &[u8]) -> Result<Ref<&[u8], T>,
 
 #[cfg(test)]
 mod test {
-    use std::{net::SocketAddrV4, thread::sleep, time::Duration};
+    use std::{net::SocketAddrV4, ops::DerefMut, thread::sleep, time::Duration};
 
     use super::*;
     use serial_test::serial;
@@ -2255,7 +2257,7 @@ mod test {
     fn keygen() -> Result<(SSk, SPk)> {
         // TODO: Copied from the benchmark; deduplicate
         let (mut sk, mut pk) = (SSk::zero(), SPk::zero());
-        StaticKem::keygen(sk.secret_mut(), pk.secret_mut())?;
+        StaticKem::keygen(sk.secret_mut(), pk.deref_mut())?;
         Ok((sk, pk))
     }
 

rp/Cargo.toml

@@ -40,3 +40,4 @@ stacker = {workspace = true}
 
 [features]
 enable_memfd_alloc = []
+experiment_libcrux = ["rosenpass-ciphers/experiment_libcrux"]

rp/src/key.rs

@@ -1,11 +1,12 @@
 use std::{
     fs::{self, DirBuilder},
+    ops::DerefMut,
     os::unix::fs::{DirBuilderExt, PermissionsExt},
     path::Path,
 };
 
 use anyhow::{anyhow, Result};
-use rosenpass_util::file::{LoadValueB64, StoreValueB64};
+use rosenpass_util::file::{LoadValueB64, StoreValue, StoreValueB64};
 use zeroize::Zeroize;
 
 use rosenpass::protocol::{SPk, SSk};
@@ -56,8 +57,8 @@ pub fn genkey(private_keys_dir: &Path) -> Result<()> {
     if !pqsk_path.exists() && !pqpk_path.exists() {
         let mut pqsk = SSk::random();
         let mut pqpk = SPk::random();
-        StaticKem::keygen(pqsk.secret_mut(), pqpk.secret_mut())?;
+        StaticKem::keygen(pqsk.secret_mut(), pqpk.deref_mut())?;
-        pqpk.store_secret(pqpk_path)?;
+        pqpk.store(pqpk_path)?;
         pqsk.store_secret(pqsk_path)?;
     } else {
         eprintln!(

secret-memory/Cargo.toml

@@ -23,4 +23,4 @@ log = { workspace = true }
 allocator-api2-tests = { workspace = true }
 tempfile = {workspace = true}
 base64ct = {workspace = true}
-procspawn = {workspace = true}
+procspawn = {workspace = true}

secret-memory/src/lib.rs

@@ -6,6 +6,7 @@ pub mod alloc;
 
 mod public;
 pub use crate::public::Public;
+pub use crate::public::PublicBox;
 
 mod secret;
 pub use crate::secret::Secret;

secret-memory/src/public.rs

@@ -172,12 +172,153 @@ impl<const N: usize> StoreValueB64Writer for Public<N> {
     }
 }
 
+#[derive(Clone, Hash, PartialEq, Eq, PartialOrd, Ord)]
+#[repr(transparent)]
+pub struct PublicBox<const N: usize> {
+    pub inner: Box<Public<N>>,
+}
+
+impl<const N: usize> PublicBox<N> {
+    /// Create a new [PublicBox] from a byte slice
+    pub fn from_slice(value: &[u8]) -> Self {
+        Self {
+            inner: Box::new(Public::from_slice(value)),
+        }
+    }
+
+    /// Create a new [PublicBox] from a byte array
+    pub fn new(value: [u8; N]) -> Self {
+        Self {
+            inner: Box::new(Public::new(value)),
+        }
+    }
+
+    /// Create a zero initialized [PublicBox]
+    pub fn zero() -> Self {
+        Self {
+            inner: Box::new(Public::zero()),
+        }
+    }
+
+    /// Create a random initialized [PublicBox]
+    pub fn random() -> Self {
+        Self {
+            inner: Box::new(Public::random()),
+        }
+    }
+
+    /// Randomize all bytes in an existing [PublicBox]
+    pub fn randomize(&mut self) {
+        self.inner.randomize()
+    }
+}
+
+impl<const N: usize> Randomize for PublicBox<N> {
+    fn try_fill<R: Rng + ?Sized>(&mut self, rng: &mut R) -> Result<(), rand::Error> {
+        self.inner.try_fill(rng)
+    }
+}
+
+impl<const N: usize> fmt::Debug for PublicBox<N> {
+    fn fmt(&self, fmt: &mut fmt::Formatter) -> fmt::Result {
+        debug_crypto_array(&**self, fmt)
+    }
+}
+
+impl<const N: usize> Deref for PublicBox<N> {
+    type Target = [u8; N];
+
+    fn deref(&self) -> &[u8; N] {
+        self.inner.deref()
+    }
+}
+
+impl<const N: usize> DerefMut for PublicBox<N> {
+    fn deref_mut(&mut self) -> &mut [u8; N] {
+        self.inner.deref_mut()
+    }
+}
+
+impl<const N: usize> Borrow<[u8]> for PublicBox<N> {
+    fn borrow(&self) -> &[u8] {
+        self.deref()
+    }
+}
+
+impl<const N: usize> BorrowMut<[u8]> for PublicBox<N> {
+    fn borrow_mut(&mut self) -> &mut [u8] {
+        self.deref_mut()
+    }
+}
+
+impl<const N: usize> LoadValue for PublicBox<N> {
+    type Error = anyhow::Error;
+
+    // This is implemented separately from Public to avoid allocating too much stack memory
+    fn load<P: AsRef<Path>>(path: P) -> anyhow::Result<Self> {
+        let mut p = Self::random();
+        fopen_r(path)?.read_exact_to_end(p.deref_mut())?;
+        Ok(p)
+    }
+}
+
+impl<const N: usize> StoreValue for PublicBox<N> {
+    type Error = anyhow::Error;
+
+    fn store<P: AsRef<Path>>(&self, path: P) -> anyhow::Result<()> {
+        self.inner.store(path)
+    }
+}
+
+impl<const N: usize> LoadValueB64 for PublicBox<N> {
+    type Error = anyhow::Error;
+
+    // This is implemented separately from Public to avoid allocating too much stack memory
+    fn load_b64<const F: usize, P: AsRef<Path>>(path: P) -> Result<Self, Self::Error>
+    where
+        Self: Sized,
+    {
+        // A vector is used here to ensure heap allocation without copy from stack
+        let mut f = vec![0u8; F];
+        let mut v = PublicBox::zero();
+        let p = path.as_ref();
+
+        let len = fopen_r(p)?
+            .read_slice_to_end(&mut f)
+            .with_context(|| format!("Could not load file {p:?}"))?;
+
+        b64_decode(&f[0..len], v.deref_mut())
+            .with_context(|| format!("Could not decode base64 file {p:?}"))?;
+
+        Ok(v)
+    }
+}
+
+impl<const N: usize> StoreValueB64 for PublicBox<N> {
+    type Error = anyhow::Error;
+
+    fn store_b64<const F: usize, P: AsRef<Path>>(&self, path: P) -> anyhow::Result<()> {
+        self.inner.store_b64::<F, P>(path)
+    }
+}
+
+impl<const N: usize> StoreValueB64Writer for PublicBox<N> {
+    type Error = anyhow::Error;
+
+    fn store_b64_writer<const F: usize, W: std::io::Write>(
+        &self,
+        writer: W,
+    ) -> Result<(), Self::Error> {
+        self.inner.store_b64_writer::<F, W>(writer)
+    }
+}
+
 #[cfg(test)]
 mod tests {
 
     #[cfg(test)]
     mod tests {
-        use crate::Public;
+        use crate::{Public, PublicBox};
         use rosenpass_util::{
             b64::b64_encode,
             file::{
@@ -185,32 +326,35 @@ mod tests {
                 Visibility,
             },
         };
-        use std::{fs, os::unix::fs::PermissionsExt};
+        use std::{fs, ops::Deref, os::unix::fs::PermissionsExt};
         use tempfile::tempdir;
 
-        /// test loading a public from an example file, and then storing it again in a different file
+        /// Number of bytes in payload for load and store tests
-        #[test]
+        const N: usize = 100;
-        fn test_public_load_store() {
-            const N: usize = 100;
 
+        /// Convenience function for running a load/store test
+        fn run_load_store_test<
+            T: LoadValue<Error = anyhow::Error>
+                + StoreValue<Error = anyhow::Error>
+                + Deref<Target = [u8; N]>,
+        >() {
             // Generate original random bytes
             let original_bytes: [u8; N] = [rand::random(); N];
 
             // Create a temporary directory
             let temp_dir = tempdir().unwrap();
 
-            // Store the original public to an example file in the temporary directory
+            // Store the original bytes to an example file in the temporary directory
             let example_file = temp_dir.path().join("example_file");
             std::fs::write(example_file.clone(), &original_bytes).unwrap();
 
-            // Load the public from the example file
+            // Load the value from the example file into our generic type
+            let loaded_public = T::load(&example_file).unwrap();
 
-            let loaded_public = Public::load(&example_file).unwrap();
+            // Check that the loaded value matches the original bytes
+            assert_eq!(loaded_public.deref(), &original_bytes);
 
-            // Check that the loaded public matches the original bytes
+            // Store the loaded value to a different file in the temporary directory
-            assert_eq!(&loaded_public.value, &original_bytes);
-
-            // Store the loaded public to a different file in the temporary directory
             let new_file = temp_dir.path().join("new_file");
             loaded_public.store(&new_file).unwrap();
 
@@ -224,10 +368,13 @@ mod tests {
             assert_eq!(new_file_contents, original_file_contents);
         }
 
-        /// test loading a base64 encoded public from an example file, and then storing it again in a different file
+        /// Convenience function for running a base64 load/store test
-        #[test]
+        fn run_base64_load_store_test<
-        fn test_public_load_store_base64() {
+            T: LoadValueB64<Error = anyhow::Error>
-            const N: usize = 100;
+                + StoreValueB64<Error = anyhow::Error>
+                + StoreValueB64Writer<Error = anyhow::Error>
+                + Deref<Target = [u8; N]>,
+        >() {
             // Generate original random bytes
             let original_bytes: [u8; N] = [rand::random(); N];
             // Create a temporary directory
@@ -238,9 +385,9 @@ mod tests {
             std::fs::write(&example_file, encoded_public).unwrap();
 
             // Load the public from the example file
-            let loaded_public = Public::load_b64::<{ N * 2 }, _>(&example_file).unwrap();
+            let loaded_public = T::load_b64::<{ N * 2 }, _>(&example_file).unwrap();
             // Check that the loaded public matches the original bytes
-            assert_eq!(&loaded_public.value, &original_bytes);
+            assert_eq!(loaded_public.deref(), &original_bytes);
 
             // Store the loaded public to a different file in the temporary directory
             let new_file = temp_dir.path().join("new_file");
@@ -253,7 +400,7 @@ mod tests {
             // Check that the contents of the new file match the original file
             assert_eq!(new_file_contents, original_file_contents);
 
-            //Check new file permissions are public
+            // Check new file permissions are public
             let metadata = fs::metadata(&new_file).unwrap();
             assert_eq!(metadata.permissions().mode() & 0o000777, 0o644);
 
@@ -271,9 +418,35 @@ mod tests {
             // Check that the contents of the new file match the original file
             assert_eq!(new_file_contents, original_file_contents);
 
-            //Check new file permissions are public
+            // Check new file permissions are public
             let metadata = fs::metadata(&new_file).unwrap();
             assert_eq!(metadata.permissions().mode() & 0o000777, 0o644);
         }
+
+        /// Test loading a [Public] from an example file, and then storing it again in a new file
+        #[test]
+        fn test_public_load_store() {
+            run_load_store_test::<Public<N>>();
+        }
+
+        /// Test loading a [PublicBox] from an example file, and then storing it again in a new file
+        #[test]
+        fn test_public_box_load_store() {
+            run_load_store_test::<PublicBox<N>>();
+        }
+
+        /// Test loading a base64-encoded [Public] from an example file, and then storing it again
+        /// in a different file
+        #[test]
+        fn test_public_load_store_base64() {
+            run_base64_load_store_test::<Public<N>>();
+        }
+
+        /// Test loading a base64-encoded [PublicBox] from an example file, and then storing it
+        /// again in a different file
+        #[test]
+        fn test_public_box_load_store_base64() {
+            run_base64_load_store_test::<PublicBox<N>>();
+        }
     }
 }

wireguard-broker/Cargo.toml

@@ -44,6 +44,7 @@ path = "src/bin/priviledged.rs"
 test = false
 doc = false
 required-features=["enable_broker_api"]
+cfg = { target_os = "linux" } 
 
 [[bin]]
 name = "rosenpass-wireguard-broker-socket-handler"
@@ -51,3 +52,4 @@ test = false
 path = "src/bin/socket_handler.rs"
 doc = false
 required-features=["enable_broker_api"]
+cfg = { target_os = "linux" } 

wireguard-broker/src/bin/priviledged.rs

@@ -1,56 +1,67 @@
-use std::io::{stdin, stdout, Read, Write};
+fn main() {
-use std::result::Result;
+    #[cfg(target_os = "linux")]
+    linux::main().unwrap();
 
-use rosenpass_wireguard_broker::api::msgs;
+    #[cfg(not(target_os = "linux"))]
-use rosenpass_wireguard_broker::api::server::BrokerServer;
+    panic!("This binary is only supported on Linux");
-use rosenpass_wireguard_broker::brokers::netlink as wg;
-
-#[derive(thiserror::Error, Debug)]
-pub enum BrokerAppError {
-    #[error(transparent)]
-    IoError(#[from] std::io::Error),
-    #[error(transparent)]
-    WgConnectError(#[from] wg::ConnectError),
-    #[error(transparent)]
-    WgSetPskError(#[from] wg::SetPskError),
-    #[error("Oversized message {}; something about the request is fatally wrong", .0)]
-    OversizedMessage(u64),
 }
 
-fn main() -> Result<(), BrokerAppError> {
+#[cfg(target_os = "linux")]
-    let mut broker = BrokerServer::new(wg::NetlinkWireGuardBroker::new()?);
+pub mod linux {
+    use std::io::{stdin, stdout, Read, Write};
+    use std::result::Result;
 
-    let mut stdin = stdin().lock();
+    use rosenpass_wireguard_broker::api::msgs;
-    let mut stdout = stdout().lock();
+    use rosenpass_wireguard_broker::api::server::BrokerServer;
-    loop {
+    use rosenpass_wireguard_broker::brokers::netlink as wg;
-        // Read the message length
-        let mut len = [0u8; 8];
-        stdin.read_exact(&mut len)?;
 
-        // Parse the message length
+    #[derive(thiserror::Error, Debug)]
-        let len = u64::from_le_bytes(len);
+    pub enum BrokerAppError {
-        if (len as usize) > msgs::REQUEST_MSG_BUFFER_SIZE {
+        #[error(transparent)]
-            return Err(BrokerAppError::OversizedMessage(len));
+        IoError(#[from] std::io::Error),
-        }
+        #[error(transparent)]
+        WgConnectError(#[from] wg::ConnectError),
+        #[error(transparent)]
+        WgSetPskError(#[from] wg::SetPskError),
+        #[error("Oversized message {}; something about the request is fatally wrong", .0)]
+        OversizedMessage(u64),
+    }
 
-        // Read the message itself
+    pub fn main() -> Result<(), BrokerAppError> {
-        let mut req_buf = [0u8; msgs::REQUEST_MSG_BUFFER_SIZE];
+        let mut broker = BrokerServer::new(wg::NetlinkWireGuardBroker::new()?);
-        let req_buf = &mut req_buf[..(len as usize)];
-        stdin.read_exact(req_buf)?;
 
-        // Process the message
+        let mut stdin = stdin().lock();
-        let mut res_buf = [0u8; msgs::RESPONSE_MSG_BUFFER_SIZE];
+        let mut stdout = stdout().lock();
-        let res = match broker.handle_message(req_buf, &mut res_buf) {
+        loop {
-            Ok(len) => &res_buf[..len],
+            // Read the message length
-            Err(e) => {
+            let mut len = [0u8; 8];
-                eprintln!("Error processing message for wireguard PSK broker: {e:?}");
+            stdin.read_exact(&mut len)?;
-                continue;
+
+            // Parse the message length
+            let len = u64::from_le_bytes(len);
+            if (len as usize) > msgs::REQUEST_MSG_BUFFER_SIZE {
+                return Err(BrokerAppError::OversizedMessage(len));
             }
-        };
 
-        // Write the response
+            // Read the message itself
-        stdout.write_all(&(res.len() as u64).to_le_bytes())?;
+            let mut req_buf = [0u8; msgs::REQUEST_MSG_BUFFER_SIZE];
-        stdout.write_all(&res)?;
+            let req_buf = &mut req_buf[..(len as usize)];
-        stdout.flush()?;
+            stdin.read_exact(req_buf)?;
+
+            // Process the message
+            let mut res_buf = [0u8; msgs::RESPONSE_MSG_BUFFER_SIZE];
+            let res = match broker.handle_message(req_buf, &mut res_buf) {
+                Ok(len) => &res_buf[..len],
+                Err(e) => {
+                    eprintln!("Error processing message for wireguard PSK broker: {e:?}");
+                    continue;
+                }
+            };
+
+            // Write the response
+            stdout.write_all(&(res.len() as u64).to_le_bytes())?;
+            stdout.write_all(&res)?;
+            stdout.flush()?;
+        }
     }
 }

wireguard-broker/src/brokers/mod.rs

@@ -1,6 +1,6 @@
 #[cfg(feature = "enable_broker_api")]
 pub mod mio_client;
-#[cfg(feature = "enable_broker_api")]
+#[cfg(all(feature = "enable_broker_api", target_os = "linux"))]
 pub mod netlink;
 
 pub mod native_unix;

wireguard-broker/src/brokers/netlink.rs

@@ -1,3 +1,5 @@
+#![cfg(target_os = "linux")]
+
 use std::fmt::Debug;
 
 use wireguard_uapi::linux as wg;